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SDHC, SDXC, SDUC, Oh My!

SDHC, SDXC, SDUC, Oh My!
SDHC, SDXC, SDUC, Oh My!

The complexity of the variety of Secure Digital ( SD ) Cards continues to confuse me, in particular the various card standards:  SD, SDHC, S...

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7:00 AM
William Leara
0
storage
7:00 AM

New SD Express Speed Classes

New SD Express Speed Classes
New SD Express Speed Classes

Secure Digital (SD) Cards have become a most critical component to all of modern technology.  They have supplanted all competitive technolo...

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7:00 AM
William Leara
0
storage
7:00 AM

Fall 2023 UEFI Developers Conference & Plugfest Materials Now Available

Fall 2023 UEFI Developers Conference & Plugfest Materials Now Available
Fall 2023 UEFI Developers Conference & Plugfest Materials Now Available

The  UEFI Fall 2023 Developers Conference & Plugfest was held October 9-12, 2023 in Hillsboro, Oregon.  This was the first in-person UE...

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7:00 AM
William Leara
0
conferences
7:00 AM

JEDEC Manufacturer IDs Are a Mess

JEDEC Manufacturer IDs Are a Mess
JEDEC Manufacturer IDs Are a Mess

The Vendor ID .  Seems like a pretty prosaic topic.  What's to say?  Every vendor has a numeric identifier that is globally unique so th...

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7:00 AM
William Leara
0
memory
7:00 AM
 
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welcome

Welcome to the Basic Input/Output website! Here I share things pertaining to the arcane art of PC BIOS development. For spice, I add material about software development in general and some interesting computer history vignettes. Please, try to contain your excitement!
—William Leara
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popular

  • JEDEC Manufacturer IDs Are a Mess
    The Vendor ID .  Seems like a pretty prosaic topic.  What's to say?  Every vendor has a numeric identifier that is globally unique so th...
  • Guide to the SWEBOK v4.0 Has Been Released
    The Guide to the Software Engineering Body of Knowledge (SWEBOK) v4.0 was released on October 15, 2024. The Guide is a publication of the ...
  • Reverse Engineering UEFI with Ghidra
    Ghidra is a free and open-source tool for software reverse engineering.  It is extensible, and allows for application-specific capabilities...
  • Introduction to Open Platform Firmware
    Platform firmware development faces a fundamental challenge: every silicon vendor brings its own initialization model, configuration schem...
  • EDID and DisplayID
    In " The Before Times" (think: 1980s), there was no way for graphics adapters and monitors to negotiate a common set of supported...
  • Introduction to Slim Bootloader
    Slim Bootloader (SBL) is an open-source boot firmware built from the ground up for Intel x86 systems. Designed to be small, fast, and secure...

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latest UEFI specs

  • UEFI Spec 2.11
  • UEFI PI Spec 1.9
  • ACPI 6.5a

UEFI resources

  • presentations, podcasts, videos
  • white papers

UEFI blog roll

  • Vincent Zimmer's blog
    20 years of beyond bios
  • BIOS on StackOverflow
    Why load the value “01301h” into AX before invoking interrupt 10h?

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